/// <summary>
/// Method collects metadata from local AWS EC2 instance.
/// </summary>
/// <returns>Returns an instance of AmazonMetadataType class.</returns>
public async Task <DataCenterMetadata> Collect()
{
DataCenterMetadata metadata = new DataCenterMetadata();
HttpClient client = new HttpClient();
metadata.AmiLaunchIndex = await GetParameter(client, "ami-launch-index");
metadata.LocalHostName = await GetParameter(client, "local-hostname");
metadata.AvailabilityZone = await GetParameter(client, "placement/availability-zone");
metadata.InstanceId = await GetParameter(client, "instance-id");
metadata.PublicIPv4 = await GetParameter(client, "public-ipv4");
metadata.PublicHostName = await GetParameter(client, "public-hostname");
metadata.AmiManifestPath = await GetParameter(client, "ami-manifest-path");
metadata.LocalIPv4 = await GetParameter(client, "local-ipv4");
metadata.HostName = await GetParameter(client, "hostname");
metadata.AmiId = await GetParameter(client, "ami-id");
metadata.InstanceType = await GetParameter(client, "instance-type");
return(metadata);
}
//Put instance back into service
//PUT /eureka/v2/apps/appID/instanceID/status?value=UP
//HTTP Code:
// * 200 on success
// * 500 on failure
public async Task <bool> PutInstanceToService(DataCenterMetadata dcData)
{
string url = this.EurekaServiceRoot + "/" + dcData.InstanceId + "/status?value=UP";
try
{
HttpClient client = this.httpClientFactory.CreateInstance();
System.Net.Http.Formatting.MediaTypeFormatter frm = new System.Net.Http.Formatting.JsonMediaTypeFormatter();
HttpResponseMessage response = await client.PutAsync(url, "", frm, "application/json");
if (response.StatusCode != System.Net.HttpStatusCode.OK)
{
string tmp = await response.Content.ReadAsStringAsync();
Trace.TraceError("Error on TakeInstanceDown: " + tmp);
return(false);
}
else
{
Trace.TraceInformation("TakeInstanceDown has been successfully submitted.");
}
}
catch (Exception ex)
{
throw ex;
}
return(true);
}
//Send application instance heartbeat
//PUT /eureka/v2/apps/appID/instanceID
//HTTP Code:
// * 200 on success
// * 404 if instanceID doesn’t exist
public async Task <bool> SendHeartbeat(DataCenterMetadata dcData)
{
string url = this.EurekaServiceRoot + "/" + dcData.InstanceId;
try
{
HttpClient client = this.httpClientFactory.CreateInstance();
System.Net.Http.Formatting.MediaTypeFormatter frm = new System.Net.Http.Formatting.JsonMediaTypeFormatter();
HttpResponseMessage response = await client.PutAsync(url, "", frm, "application/json");
//response.EnsureSuccessStatusCode();
if (response.StatusCode != System.Net.HttpStatusCode.OK)
{
string tmp = await response.Content.ReadAsStringAsync();
Trace.TraceError("Error on Heartbeat: " + tmp);
return(false);
}
else if (response.StatusCode == System.Net.HttpStatusCode.NotFound)
{
Trace.TraceWarning("Heartbeat failed. Instance does not exist.");
return(false);
}
else
{
Trace.TraceInformation("Heartbeat has been successfully submitted.");
}
}
catch (Exception ex)
{
throw ex;
}
return(true);
}
//De-register application instance
//DELETE /eureka/v2/apps/appID/instanceID
//HTTP Code: 200 on success
public async Task <bool> Unregister(DataCenterMetadata dcData)
{
string url = this.EurekaServiceRoot + "/" + dcData.InstanceId;
try
{
HttpClient client = this.httpClientFactory.CreateInstance();
HttpResponseMessage response = await client.DeleteAsync(url);
//response.EnsureSuccessStatusCode();
if (response.StatusCode != System.Net.HttpStatusCode.OK)
{
string tmp = await response.Content.ReadAsStringAsync();
Trace.TraceError("Exception on Unregister: " + tmp);
return(false);
}
else
{
Trace.TraceInformation("Unregistered successfully.");
}
}
catch (Exception ex)
{
throw ex;
}
return(true);
}
/// <summary>
/// Method collects metadata from local machine.
/// </summary>
/// <returns>Returns an instance of AmazonMetadataType class.</returns>
public Task <DataCenterMetadata> Collect()
{
var taskSource = new TaskCompletionSource <DataCenterMetadata>();
DataCenterMetadata metadata = new DataCenterMetadata();
metadata.DataCenterName = DataCenterType.MyOwn;
KaryonConfig appConfig = KaryonConfig.Current;
metadata.LocalIPv4 = appConfig.NonAmazonLocalIPv4;
metadata.PublicIPv4 = appConfig.NonAmazonPublicIPv4;
metadata.InstanceId = appConfig.NonAmazonInstanceId;
taskSource.SetResult(metadata);
return(taskSource.Task);
}
//Register new application instance
//POST /eureka/v2/apps/appID
//Input: JSON/XML payload HTTP Code: 204 on success
public async Task <bool> Register(DataCenterMetadata dcData)
{
EurekaRegistrationInfo instanceData = new EurekaRegistrationInfo();
instanceData.Instance.DataCenterInfo.Name = dcData.DataCenterName;
instanceData.Instance.DataCenterInfo.Metadata = dcData;
instanceData.Instance.HostName = dcData.HostName;// "ec2-50-16-138-165.compute-1.amazonaws.com";
instanceData.Instance.App = this.ApplicationName;
instanceData.Instance.Port = this.ApplicationPort;
instanceData.Instance.IPAddr = dcData.LocalIPv4;
instanceData.Instance.VipAddress = dcData.PublicIPv4;// "50.16.138.165";
instanceData.Instance.SecurePort = this.ApplicationSecurePort;
if (this.ApplicationSecurePort > 0)
{
instanceData.Instance.SecureVipAddress = dcData.PublicIPv4;
}
HttpClient client = null;
string url = this.EurekaServiceRoot;
try
{
System.Net.Http.Formatting.MediaTypeFormatter frm = new System.Net.Http.Formatting.JsonMediaTypeFormatter();
client = this.httpClientFactory.CreateInstance();
HttpResponseMessage response = await client.PostAsync(url, instanceData, frm, "application/json");
//response.EnsureSuccessStatusCode();
if (response.StatusCode != System.Net.HttpStatusCode.NoContent)
{
string tmp = await response.Content.ReadAsStringAsync();
Trace.TraceError("Error on Register: " + tmp);
return(false);
}
else
{
Trace.TraceInformation("Registration completed. Status: " + response.StatusCode.ToString());
}
}
catch (Exception ex)
{
throw ex;
}
return(true);
}
public DataCenterInfo()
{
this.Name = DataCenterType.Amazon;
this.Metadata = new DataCenterMetadata();
}
public HeartbeatObserver(IEurekaClient eureka, DataCenterMetadata dcMetadata, IEnumerable <string> eurekaServiceUrls)
{
this.DataCenterMetadata = dcMetadata;
this.eureka = eureka;
this.EurekaServiceUrls = eurekaServiceUrls;
}
